This is usually a winter thing for me, and I pour warm water over senior feed – basically rinsing the molasses off and end up with weak molasses tea plus wet mushy feed that I dump in a rubber pan. (I can’t just put the feed in the water bucket, he will sling it around to get the water out so he can get to the mush, making a huge mess.)
This time of year I make sure he has a bucket of cool water in his shelter so he doesn’t have to walk out in the heat to drink out of the warm stock tank.
I have to be careful with giving electrolytes because he doesn’t sweat.